Showing 2,101 - 2,120 results of 32,444 for search '(( a step decrease ) OR ( 50 ((((we decrease) OR (mean decrease))) OR (a decrease)) ))', query time: 1.03s Refine Results
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    An Analysis of Porphyrin Molecular FlexibilityUse of Porphyrin Diacids by Beisong Cheng (2970567)

    Published 1997
    “…Molecular mechanics calculations, using a modified version of MM2(87) and a newly developed force field for porphyrin diacids, correctly predict that the flexibility of <i>meso</i>-tetraaryl porphyrin diacids decreases as the steric bulk of the peripheral substituents increases:  [H<sub>4</sub>TPyP]<sup>2+</sup> ≈ [H<sub>4</sub>TPP]<sup>2+</sup> > [H<sub>4</sub>T-2,6-(OH)<sub>2</sub> PP]<sup>2+</sup> ≈ [H<sub>4</sub>T-2,6-F<sub>2</sub> PP]<sup>2+</sup> > [H<sub>4</sub>T-2,6-Cl<sub>2</sub> PP]<sup>2+</sup> ≈ [H<sub>4</sub>TMP]<sup>2+</sup>. …”
  6. 2106

    A Reverse MultipleChoice Based mLearning System by Karkar, AbdelGhani

    Published 2018
    “…Using a knowledge base, a set of answer choices will be created for a multiple-choice question. …”
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